About “Reboot and select proper Boot Device“

The following information on this error has been compiled by NeoSmart Technologies, based on the information gathered and reported by our global network of engineers, developers, and technicians or partner organizations.

Description and Symptoms

The error messages, alerts, warnings, and symptoms below are tied to this error.

Causes of this Error

This error has been known to occur as a result of one of the following causes:

Cause 1: Incorrect boot order

The most cmmon cause of this error is an incorrect boot order in BIOS. When a PC is trying to boot from an incorrect source, this error screen is displayed.

Cause 2: Partition not set as active

Another possible cause is a partition that is set as inactive. This may happen after disk write errors, power outages or virus attacks.

Fixing “Reboot and select proper Boot Device” on Windows

Windows Setup CD/DVD Required!Some of the solutions below require the use of the Microsoft Windows setup CD or DVD. If your PC did not come with a Windows installation disc or if you no longer have your Windows setup media, you can use Easy Recovery Essentials for Windows instead. EasyRE will automatically find and fix many problems, and can also be used to solve this problem with the directions below.

Fix #1: Check Boot Order

The most easiest fix for the “Reboot and select proper Boot Device” error is to make sure your computer’s boot order correctly list your hard disk as 1st option.

To check the boot order, follow these steps:

Restart your computer

Press the necessary key to open BIOS menu. This key depends on your computer manufacturer and computer model.This is usually listed on the first screen that appears on your monitor. It can be any of the following: Esc, Del, F2, F8, F10 or F12.If your screen shows multiple keys, find the key to open “BIOS”, “setup” or “BIOS menu”. The boot order is changed from here.

Notice the key guide in the top-right corner.

Go to the Boot tab

Change the boot order and list your computer’s HDD first

Boot Selection Menu

Save the settings

Restart your computer

Fix #2: Check if the hard disk has failed

To test if your hard disk is failing or it’s already failed, use Easy Recovery Essentials’ Automated Repair. Automated Repair process will report any issues found with your hard disk or RAM memory:

Fix #3: Disable Legacy Boot (UEFI only)

On computers that have UEFI instead of BIOS, having the Legacy mode option active could cause the “Reboot and select proper Boot Device” error to appear.

If that’s the case, you can simply disable the Legacy mode and restart your computer:

Restart your computer

Open the UEFI menu by pressing the necessary key. This depends on your computer manufacturer and is listed on the first screen that appears on your computer. It can be any of the following: F2, F8, F12 or the Del key.

Notice the key guide in the top-right corner.

Switch off the Legacy option. Depending on your computer model, this can be listed at the Security tab > Legacy Support.

ThinkPad UEFI-Legacy Boot Priority

Save the settings

Exit UEFI menu

Restart your computer

Fix #4: Use diskpart

If your primary partition is no longer set as active, the “Reboot and select proper Boot Device” error may appear. If setting the partition as active again would fix the error, you need to use diskpart to run the necessary commands for this:

If you have the original Windows installation media (DVD for Vista, 7, 8 and USB for 8.1), you can use that media: